📺Television

E03

TCL · 4-Series S446 4K

TCL 4-Series S446 4K E03 Error Fix: HDMI Port Failure

The TV detects a failure in one or more HDMI input ports, preventing signal transmission. This may be caused by physical damage, loose connections, or internal port circuitry faults, affecting external device connectivity.

Medium severity2 fixes available

Quick Answer

Error E03 on the TCL 4-Series S446 4K means: HDMI Port Failure. The top-ranked community fix is “Replace HDMI Board” (hard difficulty, ~60 min, DIY cost: $45-$70). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · tv

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

Root Cause Analysis

Electrical FaultPrimary

Control Board Failure

When to Call a Professional

While many tv repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $130-$190.

Other TCL Models with Error E03

5-Series S546 QLED

tv · 2 fixes

6-Series R655 Mini-LED

tv · 2 fixes

Alto 8+ 2.1 Channel Soundbar with Wireless Subwoofer and Bluetooth Connectivity

soundbar · 2 fixes

Q-Series Q6510 QLED

tv · 2 fixes

Other TCL 4-Series S446 4K Error Codes

E01

Panel Backlight Failure

2 fixes

E02

Wi-Fi Module Not Detected

T-Con Board Error

Power Supply Voltage Error

2 fixes

E06

IR Remote Sensor Fault

2 fixes

E07

Audio Amplifier Failure

2 fixes

E08

Over Temperature Protection Triggered

2 fixes

E09

Firmware Corruption Detected

2 fixes

People Also Ask About TCL 4-Series S446 4K Error E03

What does error code E03 mean on a TCL 4-Series S446 4K?

Error code E03 on the TCL 4-Series S446 4K means: HDMI Port Failure. The TV detects a failure in one or more HDMI input ports, preventing signal transmission. This may be caused by physical damage, loose connections, or internal port circuitry faults, affecting external device connectivity.

How do I fix error code E03 on my TCL 4-Series S446 4K?

The most successful fix is "Replace HDMI Board" (hard difficulty, ~60 minutes). Estimated DIY cost: $45-$70. HomeMD has 2 community-ranked fixes for this error.

Is error code E03 on a TCL 4-Series S446 4K serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix TCL 4-Series S446 4K error E03 myself?

Yes — the top-ranked community fix ("Replace HDMI Board") is rated hard difficulty and takes about 60 minutes. Tools needed: Phillips screwdriver, ESD wrist strap.

How much does it cost to repair TCL 4-Series S446 4K error E03?

DIY cost: $45-$70. Professional repair typically costs $130-$190. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the TCL 4-Series S446 4K have?

The TCL 4-Series S446 4K has 8 other known error codes, including: E01 (Panel Backlight Failure), E02 (Wi-Fi Module Not Detected), E04 (T-Con Board Error), E05 (Power Supply Voltage Error), E06 (IR Remote Sensor Fault), and 3 more.

Which other TCL models have the E03 error?

Error code E03 also appears on 4 other TCL models: 5-Series S546 QLED, 6-Series R655 Mini-LED, Alto 8+ 2.1 Channel Soundbar with Wireless Subwoofer and Bluetooth Connectivity, Q-Series Q6510 QLED. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the TCL 4-Series S446 4K have?

The TCL 4-Series S446 4K has 8 other known error codes:

E01 — Panel Backlight Failure (2 fixes)
E02 — Wi-Fi Module Not Detected (2 fixes)
E04 — T-Con Board Error (2 fixes)
E05 — Power Supply Voltage Error (2 fixes)
E06 — IR Remote Sensor Fault (2 fixes)
E07 — Audio Amplifier Failure (2 fixes)
E08 — Over Temperature Protection Triggered (2 fixes)
E09 — Firmware Corruption Detected (2 fixes)

Which other TCL models have the E03 error?

Error code E03 also appears on 4 other TCL models:

5-Series S546 QLED (tv) · 2 fixes
6-Series R655 Mini-LED (tv) · 2 fixes
Alto 8+ 2.1 Channel Soundbar with Wireless Subwoofer and Bluetooth Connectivity (soundbar) · 2 fixes
Q-Series Q6510 QLED (tv) · 2 fixes

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